ELT-SHARP Proposal Targets Chemo-Dynamical Mapping of Local Group to Test Lambda CDM on Sub-Galactic Scales
The SHARP proposal on ELT outlines future observations to map Local Group galaxy assembly and test dark matter predictions at small scales. It emphasizes multi-mode NIR spectroscopy but remains a planning document without empirical data. Primary limitation is reliance on unbuilt instrumentation and cross-survey coordination.
The proposal specifies adaptive-optics-assisted spectroscopy at resolutions up to R=17,000 over 1.2 arcmin fields plus sub-arcsecond IFU mapping to penetrate dust and crowded fields. It integrates planned data with Gaia, APOGEE, LAMOST, and 4MOST surveys to reconstruct six-dimensional phase-space structures, bars, warps, and satellite interactions. No new observations exist yet; the paper functions as an instrument justification rather than a results paper. This approach directly addresses reported Lambda CDM tensions in galactic dynamics by prioritizing resolved stellar tracers over integrated light. Complementary wavelength coverage enables simultaneous access to multiple kinematic and abundance indicators that single-mode instruments cannot capture efficiently.
Sources (2)
- [1]Primary Source(https://arxiv.org/abs/2611.06963)
- [2]Supporting Source(https://www.eso.org/sci/facilities/eelt/instruments/)